• (a.) Formed of a mixture of horny and calcareous materials, as some shells and corals. • (a.) Horny on one side and calcareous on the other.
Cor'ne·o·cal·ca're·ous adjective 1. (Zoology) Formed of a mixture of horny and calcareous materials, as some shells and corals. 2. Horny on one side and calcareous on the other.